JPS6224218B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a method of manufacturing a piston ring,
More specifically, the present invention relates to a method of forming an outer circumferential sliding surface of a piston ring.

Conventionally, piston rings with various outer circumferential sliding surface shapes have been proposed and used depending on the application. When the surface of the piston ring is fully adapted to the inner circumferential surface of the cylinder on which it slides, the shape of the piston ring's outer circumferential sliding surface when installed generally changes to a unique shape depending on the engine model. be.

By the way, many problems related to piston rings, such as excessive blow-by, oil consumption, or abnormal wear, are caused by the outer sliding surface of the piston ring installed in the engine sufficiently fitting into the inner wall surface of the mating cylinder. This is likely to occur during the break-in period, that is, until the outer peripheral sliding surface shape unique to the engine is formed.

In view of the above, the present invention has been made for the purpose of providing a piston ring that prevents the occurrence of the above-mentioned troubles caused by the piston ring during the initial break-in period, and which is installed in an internal combustion engine and used for a long time. By doing this, the outer circumferential sliding surface of the piston ring is shaped so that it fits well with the inner wall surface of the mating cylinder. The present invention relates to a method for forming an outer circumferential sliding surface of a piston ring, in which the cross-sectional shape of the outer circumferential sliding surface of the piston ring is processed to have the same cross-sectional shape as the outer circumferential sliding surface of the used piston ring. below,
The invention will be explained by means of illustrated embodiments.

In Fig. 1, numeral 1 is a piston ring that has been installed in an internal combustion engine and used for a long time (hereinafter referred to as a used piston ring), and its outer peripheral sliding surface 2 has worn out due to long-term use. However, the outer circumferential sliding surface shape is unique to that engine model. These used piston rings 1 are stacked with their outer peripheral surfaces aligned and held from the side by a holding plate 3. Reference numeral 4 denotes a copying member which advances and retreats following the familiar outer circumferential sliding surface 2 by moving in the main axis direction of the piston ring while one end is in contact with the outer circumferential sliding surface 2 of the used piston ring. A dresser device 5 made of diamond or the like is provided at the other end.

The dresser device 5 contacts the outer circumferential surface of a rotary grindstone 6 rotated by a rotating device (not shown) and dresses the outer circumferential surface into a shape corresponding to the outer circumferential sliding surface shape of the used piston ring.

The grinding wheel whose outer circumferential shape has been finished as described above is rotated, and the grinding wheel surface is brought into contact with the outer circumferential surface of the laminated and rotated material piston ring (not shown) to carry out the grinding process. A piston ring can be obtained that already has an outer circumferential surface shape that is substantially the same as the outer circumferential sliding surface shape of a used piston ring before use.

Another embodiment of the invention is shown in FIGS. 3 and 4.

The used piston ring 1 is held by the holding plate 3 with the outer peripheral sliding surface 2 aligned. A slide 8 that moves parallel to the main axis of the used piston ring 1 has a copying member 10 guided through a guide hole 9.
is provided, and one end of the copying member 10 moves forward and backward while abutting against the outer circumferential sliding surface 2 of the used piston ring, following the cross-sectional shape of the outer circumferential sliding surface 2 as the slide 8 moves.

Here, 11 is a spring that presses the copying member 10 against the outer peripheral sliding surface of the used piston ring. The copying member 10 has a cutting tool 1 at the other end.
7, and this cutting tool cuts the outer surface of the rotating cylindrical body located opposite to the used piston ring into a shape corresponding to the outer peripheral sliding surface shape of the used piston ring 1.

Next, using the outer surface of the cylindrical body processed as described above as the cam surface 18, as shown in FIG.
One end of 9 is brought into contact with the cam surface 18, and the copying member 1
The outer peripheral surface of the raw piston ring 7 is cut using a cutting tool 20 provided at the other end of the piston ring 9, so that the cross-sectional shape of the outer peripheral surface of the raw piston ring is substantially the same as the cross-sectional shape of the outer peripheral sliding surface of the used piston ring. Processed into a uniform cross-sectional shape.

FIG. 2 shows yet another embodiment of the invention. The used piston ring 1 is held by the holding plate 3 with the outer peripheral sliding surface 2 aligned.

A slide 8 that moves parallel to the main axis of the used piston ring 1 is provided with a copying member 10 that is guided through a guide hole 9.
One end is the outer sliding surface 2 of the used piston ring.
As the slide 8 moves, the cross-sectional shape of the outer circumferential sliding surface 2 moves forward and backward while being in contact with the slide 8 .

Here, 11 is a spring that presses the copying member 10 against the outer peripheral sliding surface of the used piston ring.

The other end of the copying member 10 is rotatably connected by a pin 14 to one end of a link 13 rotatably attached to a pin 12 provided on the slide 8. is rotatably connected to a driven member 15 provided through a guide hole of an auxiliary slide 21 provided on the slide 8 and movable relative to the slide 8 and in the direction of the main axis of the piston ring 1.

Therefore, the driven member 15 moves in the opposite direction to the moving direction of the copying member 10 when the copying member 10 moves forward and backward. The driven member 15 has a cutting tool 17 at its end, and the cutting tool comes into contact with the outer peripheral surface of the raw piston ring 7 to cut the surface.

The positional relationship between the used piston ring 1 and the raw piston ring 7 is such that the tip of the copying member 10 is located at the center of the width of the used piston ring 1, and the tip of the cutting tool 17 is located at the center of the width of the raw piston ring 7. It is assumed that the state is located at .

By cutting the outer peripheral surface of the raw piston ring by the above-described means, the outer peripheral surface shape of the raw piston ring is made to be substantially the same as the outer peripheral surface shape of the used piston ring.

As described above, according to the present invention, the shape of the outer circumferential sliding surface of the piston ring in an unused state is substantially the same as the outer circumferential sliding surface shape of the used piston ring. When using the piston ring manufactured according to the present invention, troubles related to the piston ring such as blow-by, increased oil consumption, and abnormal wear that tend to occur during the initial run-in of the engine can be prevented. be able to.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional view illustrating an embodiment of the present invention, FIG. 2 is an explanatory diagram showing another embodiment of the present invention partially in cross section, and FIGS. 3 and 4 are further embodiments of the present invention. It is an explanatory view showing an example of. In the figure: 1...Used piston ring (piston ring with a familiar outer circumferential sliding surface shape),
2...Outer sliding surface of used piston ring, 3
... Ring holding plate, 4 ... Copying member, 5 ... Dresser device, 6 ... Rotary grindstone, 7 ... Material piston ring, 8 ... Slide, 9 ... Copying member, 11
... Spring, 17 ... Cutting tool, 18 ... Cam surface, 20 ... Cutting tool.

Claims (1)

[Claims] 1. The outer circumferential sliding of a raw piston ring follows the cross-sectional shape of the outer circumferential sliding surface of a used piston ring that has been installed and used in an engine and whose outer circumferential sliding surface has a sufficiently familiar shape. A method for forming an outer circumferential sliding surface of a piston ring, comprising processing a surface so that the cross-sectional shape of the outer circumferential sliding surface of the piston ring is the same as the cross-sectional shape of the outer circumferential sliding surface of the used piston ring. 2. A dresser device 5 is provided at the other end of the copying member 4 that moves in the axial direction of the piston ring following the cross-sectional shape of the outer circumferential sliding surface while one end thereof is in contact with the outer circumferential sliding surface 2 of the used piston ring, By grinding the outer circumferential surface of the raw piston ring using a rotary grindstone, which has a longitudinal cross-sectional shape corresponding to the cross-sectional shape of the outer circumferential surface of the used piston ring by dressing with the dresser device, 2. The method for forming a piston ring outer circumferential sliding surface according to item 1, wherein the cross-sectional shape of the piston ring outer circumferential sliding surface is processed to have the same cross-sectional shape as the outer circumferential sliding surface of a used piston ring. 3 Machining with a cutting tool installed at the other end of the copying member that moves in the axial direction of the piston ring while tracing the cross-sectional shape of the outer circumferential sliding surface while one end is in contact with the outer circumferential sliding surface 2 of the used piston ring. By doing so, a cam 18 having a cam surface having a shape corresponding to the cross-sectional shape of the outer peripheral sliding surface of the used piston ring is created, and a copying member 19 that moves forward and backward by following the cam surface of the cam 18 is created. Item 1 above, wherein the outer circumferential surface of the piston ring is cut by a cutting tool provided at the other end to make the cross-sectional shape of the outer circumferential sliding surface of the piston ring the same as the cross-sectional shape of the outer circumferential sliding surface of the used piston ring. A method for forming the outer circumferential sliding surface of a piston ring.